adj
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insensitive ; emotionally hardened
무감각한 ; 감정이 무딘
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The callous biology teacher gave a B to the whining student, even though he swore that such a low grade would keep him out of medical school.
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Living in New York for ten years has made Sally so callous that to reach her mailbox she steps on the back of the homeless person who sleeps in the lobby of her apartment building
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A callus is a patch of thickened or roughened skin. A callous person is someone who has a metaphorical callus covering his or her emotions.